M157 AMG turbochargers successfully swapped onto C218 Mercedes CLS550 M278 4.7 liter V8

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The Mercedes M278 and M157 engines may differ in displacement but they are the same basic design. They actually share many commonalities. While the M278 is not an AMG engine the M157 is basically just an M278 engine on steroids.

The M278 has a bore and stroke of 92.9mm x 86mm and the M157 has a bore and stroke of 98.0mm x 90.5mm. The motors share the same basic block and obviously the same cylinder count.

Since the early days that the M278 went on the market in Mercedes 550 models people have wondered what M157 parts would transfer over if any. Well, wonder no more. A C218 CLS550 owner who goes by the name 'gardevski' on the forums swapped the M157 turbochargers onto his CLS550.

The result?

The car is prepared for the ECU tuning at the end of this week. The exhaust and turbochargers are installed and all fitted great. I can confirm that the turbochargers are direct swap with no additional or any other parts needed except the gaskets and o-rings (it's recommended to use new when changing or repairing turbocharger)

Will post dyno and photos of the exhaust and downpipes installation. Will keep you informed.

I have good news. The car was completed today and run 680hp on 91gas and 700+ on 93. I can tell you that this is a true beast. It's noting compared to the stock turbos.. Will prepare all the details tomorrow when i have more time including the dyno run and will let you all know more detail

The problem? He did not post the dyno run or details. We do not doubt he did it we just would like to see proof as well as information on who tuned the setup.

Suddenly the M278 looks like a Mercedes tuning value.